| |
Graphene on Cu
|
Graphene on SiO
2
|
|---|
Acquisition | Raman Shift | FWHM | IG/I2D | Raman Shift | FWHM | IG/I2D |
|---|
| | (cm-1) | (cm-1) | | (cm-1) | (cm-1) | |
|---|
1 | 2711.4 | 70.0 | 0.86 | 2704.0 | 40.3 | 1.01 |
2 | 2701.3 | 60.0 | 0.60 | 2702.7 | 37.7 | 0.79 |
3 | 2699.8 | 49.2 | 0.56 | 2699.0 | 43.8 | 0.80 |
4 | 2698.2 | 46.6 | 0.46 | 2701.1 | 38.7 | 0.61 |
- Comparison of the position and FWHM of 2D peaks of subsequent Raman acquisitions as extracted by a single Lorentzian fit and evolution of the IG/I2D ratio (spectra from Figure7, Figure8). Uncertainties of the order of 0.01 – 0.04% for the 2D peak Raman shifts and of 3 – 6% for 2D peak FHWMs have been estimated. Note: results concerning transferred graphene are affected by a higher uncertainty because of pronounced secondary peaks (possibly due to residual PMMA used for graphene transfer) present in the Raman spectra (see Figure7(b)), making the fit procedure less accurate.
